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LibM: Improve pow() and powf()

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This commit is contained in:
Linus Groh 2020-04-06 18:56:04 +01:00 • committed by Andreas Kling
parent 4fe14aab3b
commit 220ecde626
1 changed files with 28 additions and 1 deletions
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29
Libraries/LibM/math.cpp
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@ -101,12 +101,39 @@ float sinf(float angle)
double pow(double x, double y) double pow(double x, double y)
{ {
//FIXME: Extremely unlikely to be standards compliant. // FIXME: Please fix me. I am naive.
if (y == 0)
return 1;
if (y == 1)
return x;
int y_as_int = (int)y;
if (y == (double)y_as_int) {
double result = x;
for (int i = 0; i < abs(y) - 1; ++i)
result *= x;
if (y < 0)
result = 1.0 / result;
return result;
}
return exp(y * log(x)); return exp(y * log(x));
} }
float powf(float x, float y) float powf(float x, float y)
{ {
// FIXME: Please fix me. I am naive.
if (y == 0)
return 1;
if (y == 1)
return x;
int y_as_int = (int)y;
if (y == (float)y_as_int) {
float result = x;
for (int i = 0; i < abs(y) - 1; ++i)
result *= x;
if (y < 0)
result = 1.0 / result;
return result;
}
return (float)exp((double)y * log((double)x)); return (float)exp((double)y * log((double)x));
} }